/* Palette: Nelson Mandela Bay — mist, deep sea, harbour, aloe, signal amber */
:root {
  --mist: #EEF2F0;
  --mist-deep: #E1E8E4;
  --ink: #0E2A2F;
  --ink-soft: #3E565A;
  --harbour: #1F5C6B;
  --aloe: #7FA38A;
  --signal: #D9A021;
  --line: #C7D3CE;
  --surface: #F8FAF9;

  --display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --body: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;

  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.3125rem;
  --step-2: 1.75rem;
  --step-3: 2.5rem;
  --step-4: clamp(3rem, 8vw, 5.75rem);

  --gutter: clamp(1rem, 4vw, 3rem);
  --max: 72rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --mist: #0C2226;
    --mist-deep: #12302F;
    --ink: #E6EEEB;
    --ink-soft: #A9BDB8;
    --harbour: #7FC0CF;
    --aloe: #93BBA0;
    --signal: #E8B740;
    --line: #2A4649;
    --surface: #10292D;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --mist: #0C2226;
  --mist-deep: #12302F;
  --ink: #E6EEEB;
  --ink-soft: #A9BDB8;
  --harbour: #7FC0CF;
  --aloe: #93BBA0;
  --signal: #E8B740;
  --line: #2A4649;
  --surface: #10292D;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--mist);
  color: var(--ink);
  font-family: var(--body);
  font-size: var(--step-0);
  line-height: 1.6;
}

h1, h2, h3 { font-family: var(--display); line-height: 1.1; margin: 0; }
p { margin: 0 0 1rem; }
a { color: var(--harbour); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute; left: 1rem; top: -3rem;
  background: var(--ink); color: var(--mist); padding: 0.5rem 1rem; z-index: 10;
}
.skip:focus { top: 1rem; }

/* Header */
.site-header {
  max-width: var(--max); margin: 0 auto; padding: 1.25rem var(--gutter);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.wordmark {
  font-family: var(--display); font-weight: 800; font-size: 1.25rem;
  color: var(--ink); text-decoration: none;
  width: 2.5rem; height: 2.5rem; display: grid; place-items: center;
  border: 2px solid var(--ink); border-radius: 50%;
}
.site-header ul { list-style: none; display: flex; gap: clamp(0.75rem, 3vw, 2rem); margin: 0; padding: 0; }
.site-header nav a { color: var(--ink); text-decoration: none; font-weight: 700; }
.site-header nav a:hover { color: var(--harbour); text-decoration: underline; }

main > section { max-width: var(--max); margin: 0 auto; padding: clamp(3rem, 8vw, 6rem) var(--gutter); }

/* Hero */
.hero {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center;
  padding-top: clamp(2rem, 5vw, 4rem) !important;
}
.hello { font-family: var(--display); font-size: var(--step-1); color: var(--harbour); margin-bottom: 0.5rem; }
.hero h1 {
  font-size: var(--step-4); font-weight: 800; letter-spacing: -0.03em;
  font-variation-settings: "opsz" 96;
  margin-bottom: 1.5rem;
}
.lede { font-size: var(--step-1); line-height: 1.5; max-width: 34ch; color: var(--ink-soft); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }

.btn {
  display: inline-block; padding: 0.8rem 1.4rem; border-radius: 999px;
  font-weight: 700; text-decoration: none; border: 2px solid var(--ink);
}
.btn-primary { background: var(--ink); color: var(--mist); }
.btn-primary:hover { background: var(--harbour); border-color: var(--harbour); }
.btn-quiet { color: var(--ink); }
.btn-quiet:hover { background: var(--mist-deep); }

/* Layers diagram — the one bold element */
.layers { margin: 0; }
.layers-svg { width: 100%; max-width: 26rem; display: block; margin: 0 auto; overflow: visible; }
.ring circle {
  fill: var(--mist); stroke: var(--line); stroke-width: 2;
  transition: fill 0.35s ease, stroke 0.35s ease;
}
.ring[data-layer="people"] circle { fill: var(--mist-deep); }
.ring text {
  font-family: var(--display); font-size: 15px; font-weight: 600;
  text-anchor: middle; fill: var(--ink-soft); pointer-events: none;
  transition: fill 0.35s ease;
}
.ring { cursor: pointer; }
.ring.active circle { fill: var(--harbour); stroke: var(--harbour); }
.ring.active text { fill: var(--mist); }
.ring.inside circle { stroke: var(--harbour); }

/* Load moment: rings draw from outside in, once */
@media (prefers-reduced-motion: no-preference) {
  .ring { opacity: 0; transform-origin: 200px 200px; animation: ring-in 0.7s cubic-bezier(.2,.7,.2,1) forwards; }
  .ring[data-layer="people"] { animation-delay: 0.05s; }
  .ring[data-layer="infra"] { animation-delay: 0.2s; }
  .ring[data-layer="pipeline"] { animation-delay: 0.35s; }
  .ring[data-layer="code"] { animation-delay: 0.5s; }
  @keyframes ring-in { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }
}

.layer-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem; margin: 1.5rem 0 1rem; }
.layer-tabs button {
  font: inherit; font-weight: 700; font-size: var(--step--1);
  padding: 0.45rem 0.9rem; border-radius: 999px;
  border: 2px solid var(--line); background: transparent; color: var(--ink); cursor: pointer;
}
.layer-tabs button[aria-selected="true"] { background: var(--ink); color: var(--mist); border-color: var(--ink); }
.layer-panel { text-align: center; min-height: 5.5rem; }
.layer-panel p { color: var(--ink-soft); font-size: var(--step--1); margin-bottom: 0.6rem; }
.layer-panel ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 0.4rem 1rem; }
.layer-panel li { font-weight: 700; }
.layer-panel li + li::before { content: none; }

/* Section headings */
main h2 { font-size: var(--step-3); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 2rem; }

/* About */
.about { display: grid; grid-template-columns: 1fr 2fr; gap: 2rem; border-top: 2px solid var(--ink); }
.prose { max-width: 62ch; font-size: var(--step-1); line-height: 1.55; }

/* Work */
.work { border-top: 2px solid var(--ink); }
.feature {
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 0;
  background: var(--surface); border: 2px solid var(--ink); border-radius: 1.25rem; overflow: hidden;
}
.feature-body { padding: clamp(1.5rem, 4vw, 3rem); }
.kicker { color: var(--harbour); font-weight: 700; margin-bottom: 0.5rem; }
.feature h3 { font-size: var(--step-3); font-weight: 800; margin-bottom: 1rem; }
.feature-body > p { max-width: 55ch; }
.facts { padding-left: 1.2rem; margin: 0 0 1.5rem; max-width: 60ch; }
.facts li { margin-bottom: 0.4rem; }
.facts li::marker { color: var(--aloe); }
.link { font-weight: 700; }

.feature-visual {
  background: var(--harbour); display: grid; place-items: center; padding: 2rem;
}
.stack { display: grid; gap: 0.5rem; width: min(100%, 15rem); }
.stack span {
  display: block; text-align: center; padding: 0.9rem 1rem; border-radius: 0.6rem;
  font-family: var(--display); font-weight: 600; color: var(--mist);
  border: 2px solid color-mix(in srgb, var(--mist) 60%, transparent);
}
.stack span:nth-child(2) { background: color-mix(in srgb, var(--mist) 14%, transparent); }
.stack span:nth-child(3) { background: color-mix(in srgb, var(--mist) 26%, transparent); }

.rows { margin-top: 1rem; }
.row {
  display: grid; grid-template-columns: 1fr 2fr; gap: 0.5rem 2rem;
  padding: 2rem 0; border-bottom: 1px solid var(--line);
  scroll-margin-top: 1rem;
}
.row h3 { font-size: var(--step-2); font-weight: 600; grid-row: span 2; }
.row p { max-width: 62ch; }
.row .meta { color: var(--ink-soft); font-size: var(--step--1); margin: 0; }
.row.upcoming h3, .row.upcoming p:not(.meta) { color: var(--ink-soft); }

/* Path */
.path { border-top: 2px solid var(--ink); }
.timeline { list-style: none; margin: 0; padding: 0; position: relative; max-width: 50rem; }
.timeline::before {
  content: ""; position: absolute; left: 6.25rem; top: 0.6rem; bottom: 0.6rem;
  width: 2px; background: var(--line);
}
.timeline li { display: grid; grid-template-columns: 5.5rem 1fr; gap: 2rem; padding-bottom: 2rem; position: relative; }
.timeline li::after {
  content: ""; position: absolute; left: calc(6.25rem - 5px); top: 0.45rem;
  width: 12px; height: 12px; border-radius: 50%; background: var(--mist); border: 2px solid var(--harbour);
}
.timeline li:last-child::after { background: var(--signal); border-color: var(--signal); }
.when { font-family: var(--display); font-weight: 800; color: var(--harbour); text-align: right; }
.timeline h3 { font-size: var(--step-1); font-weight: 600; margin-bottom: 0.25rem; }
.timeline p { color: var(--ink-soft); margin: 0; }

/* Contact */
.contact { border-top: 2px solid var(--ink); }
.contact > p { font-size: var(--step-1); max-width: 45ch; }
.contact-links { list-style: none; padding: 0; margin: 1.5rem 0 0; display: flex; flex-wrap: wrap; gap: 0.75rem; }
.contact-links a {
  display: inline-block; padding: 0.8rem 1.4rem; border-radius: 999px; border: 2px solid var(--ink);
  font-weight: 700; color: var(--ink); text-decoration: none;
}
.contact-links a:hover { background: var(--ink); color: var(--mist); }

.site-footer { max-width: var(--max); margin: 0 auto; padding: 2rem var(--gutter) 3rem; color: var(--ink-soft); font-size: var(--step--1); }

/* Responsive */
@media (max-width: 52rem) {
  .hero { grid-template-columns: 1fr; }
  .about { grid-template-columns: 1fr; gap: 0; }
  .feature { grid-template-columns: 1fr; }
  .feature-visual { order: -1; padding: 1.5rem; }
  .row { grid-template-columns: 1fr; }
  .row h3 { grid-row: auto; }
}
@media (max-width: 30rem) {
  .site-header { flex-wrap: wrap; }
  .site-header ul { gap: 0.9rem; font-size: var(--step--1); }
  .timeline::before { left: 4.25rem; }
  .timeline li { grid-template-columns: 3.5rem 1fr; gap: 1.5rem; }
  .timeline li::after { left: calc(4.25rem - 5px); }
  .when { font-size: var(--step--1); }
}